---
id: platform-tuios-package
area: platform
level: 3
title: "Artefact — A hand-written Nix package with an exit plan"
claim: "Twenty-five lines of Nix that pin a tool at 0.10.1 over nixpkgs' 0.7.0 — with a verified hash · a written reason and a written condition for deleting the file."
confidence: running
period: "2026–"
tech: [Nix, NixOS]
metrics: [{label: "pinned version", value: "0.10.1"}, {label: "nixpkgs version it overrides", value: "0.7.0"}]
artefacts: []
public: true
last_verified: 2026-10-26
tags: [platform, nix, packaging, artefact]
---

# Artefact — A hand-written Nix package with an exit plan

**Status: stub.** The whole file is short enough to publish verbatim; it lands in Phase 7.

## What the artefact is

A package definition for the agent operations console: `fetchurl` against a released artifact with a verified hash, a documented reason for overriding nixpkgs, an `installPhase` that stages the binary, and a comment stating the condition under which the file should be deleted.

## What it proves

More than knowing Nix exists. The signals are that someone noticed a version gap, fixed it locally instead of waiting, pinned it so the fleet is reproducible, and wrote down when to remove their own patch. Knowing when to delete your own override is the senior part.

## When it is delivered

Phase 7. The file is in the infrastructure repository; source fact: content spine section 4.2.